Chemical Reaction Engineering
A space velocity of 5 hr⁻¹ means that

Cent per cent conversion can be achieved in at least 5 hours
A fixed conversion of a given batch of feed takes 5 hours
Five reactor volumes of feed (at specified conditions) are being fed into the reactor per hour
After every 5 hours, reactor is being filled with the feed

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Chemical Reaction Engineering
For a tubular reactor with space time 'τ' and residence time 'θ', the following statement holds good.

τ = θ , for a non-isothermal reactor
τ and θ are always equal
τ = θ , when the fluid density changes in the reactor
τ = θ , for an isothermic tubular reactor in which the density of the process fluid is constant

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Chemical Reaction Engineering
The reaction rate almost gets doubled for 10°C rise in temperature. This is due to the fact that the

Value of threshold energy decreases
Increased temperature reduces the activation energy
Collision frequency increases
Fraction of molecules having threshold energy increases

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